Malicious PDF — malware analysis report

Static analysis result for SHA-256 671ab757bfc1c64c…

MALICIOUS

PDF

34.1 KB Created: 2020-08-12 21:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 066f6c0cd792efc37999e2a6502b4bdd SHA-1: 1366bb349ef2641344fb4bc6caedebc599675f32 SHA-256: 671ab757bfc1c64c43b301433074736d80f1d0972b2c27f0da05ee9ef3d6285c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a link farm designed to manipulate search engine results, and PDF_MALICIOUS_REDIRECTOR_LINK confirms that at least one link leads to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=biblia+takatifu+swahili+pdf
    • http://files.busybeesweet.com/uploads/1/3/1/3/131398452/0e2c6ff.pdf
    • http://files.kosative.com/uploads/1/3/1/3/131379014/1883196.pdf
    • http://files.utilitytec.com/uploads/1/3/0/7/130739924/lixojepox_rakepivatazazim_zuvasu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2086/9019/files/jewibovuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52244446143.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/netekemotisaderiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0133/9304/files/7712956357.pdf
    • https://cdn.shopify.com/s/files/1/0430/9788/2773/files/totadusasuninifavimoruzo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/kujemopesaves.pdf
    • https://cdn.shopify.com/s/files/1/0429/5609/5644/files/10283411473.pdf
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/82429652380.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/fumizugoselanunom.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/crisis_adrenal_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/vopijujataxasoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3184/files/alvin_schwartz_scary_stories_3.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/sebc_caste_list_in_gujarat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047d5.bin
e2d94278d2497538a9426671ddf876f4f45dd5cb384fc00197ef62a71c3421a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47D5 5380 bytes
font_01_sfnt_off00005a23.bin
b45bae25ca6cababbb9a14e29e6acda26cc2e953a68f7f1b4b9d93584f7ecdc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A23 9892 bytes

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